| ‘Zhongtian’rose was introduced in Huaiji, Guangdong, and the agronomic traits were compared among the 1-year , 2-year and 3-year seedlings . The contents of amino acids, mineral elements, polysaccharides, total phenols and total flavonoids were tested, and their antioxidant capacity，the contents of heavy metal and pesticide residues were also evaluated. The results showed that the rose grew well in Huaiji bloomed four or five times a year. Sixteen amino acids (including 7 essential amino acids) were detected in the flowers. The total amount of amino acids was 7.42% of dry weight, the ratio of medicinal amino acids was 65.77%, and the ratio coefficient of amino acids (SRC) was 74.96. Flowers contained 7 mineral elements including Ca, K, Mg, Zn, Cu, Mn and Fe, the contents of K and Mn were higher. In addition, the contents of polysaccharides, total phenols and flavonoids in flowers were 31.77%, 6.31% and 3.14%, respectively. The antioxidant test showed that the scavenging rate of ATBS was up to 92.10% at the concentration of 0.25 mg/mL for flower extract, while the DPPH scavenging rate was as high as 96.02% at the concentration of 0.06 mg/mL. The three heavy metals of ars enic, lead and cadmium and five pesticide residues all met relevant standards. In conclusion, 'Zhongtian' rose is suitable for planting in Huaiji, and has higher food, medical and health values. |
